So, is there any known way to enchant clothing beyond +10% mana regeneration for the "School spells cost XX% less to cast. Magicka regenerates YY% faster." enchantments? (other than a magic overhaul mod - I prefer to keep my mod changes very tiny and focused)

It rather sucks that if you want that type of enchantment, you have to stick with found/bought chest pieces or else spend the second enchantment slot on regen (and still not come anywhere close to matching the regen rates you get on the found/bought versions). :/

Not talking about the skill reduction portion of that effect. Talking about the +10% mana regeneration portion of the effect - it can go up to at least +100% on found/bought items, but even with 5/5 Enchanter (+100% to effects) and Corpus Enchanter (+25% to fortify & regen effects for magicka, health, and stamina), it's stuck at a pathetic +10% on enchanted gear.